ref: 2cdc6577ef8a251bf1740439cf5bfc47050dab41
dir: /third_party/boringssl/src/crypto/bio/printf.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/bio.h>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <openssl/err.h>
#include <openssl/mem.h>
int BIO_printf(BIO *bio, const char *format, ...) {
va_list args;
char buf[256], *out, out_malloced = 0;
int out_len, ret;
va_start(args, format);
out_len = vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
#if defined(OPENSSL_WINDOWS)
// On Windows, vsnprintf returns -1 rather than the requested length on
// truncation
if (out_len < 0) {
va_start(args, format);
out_len = _vscprintf(format, args);
va_end(args);
assert(out_len >= (int)sizeof(buf));
}
#endif
if (out_len < 0) {
return -1;
}
if ((size_t) out_len >= sizeof(buf)) {
const int requested_len = out_len;
// The output was truncated. Note that vsnprintf's return value
// does not include a trailing NUL, but the buffer must be sized
// for it.
out = OPENSSL_malloc(requested_len + 1);
out_malloced = 1;
if (out == NULL) {
OPENSSL_PUT_ERROR(BIO, ERR_R_MALLOC_FAILURE);
return -1;
}
va_start(args, format);
out_len = vsnprintf(out, requested_len + 1, format, args);
va_end(args);
assert(out_len == requested_len);
} else {
out = buf;
}
ret = BIO_write(bio, out, out_len);
if (out_malloced) {
OPENSSL_free(out);
}
return ret;
}